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747-400 MAINTENANCE MANUAL
 S 844-004
 (3)  Decrease the pressure on the hydraulic system No. 1 (Ref 29-11-00/201).
 S 844-005
 WARNING: DECREASE THE PRESSURE ON THE ACTUATOR AND THE LINES BEFORE YOU
_______ DISCONNECT THE PRESSURE VALVE. THIS WILL PREVENT INJURY TO PERSONS.
 (4)  
Open the bleed valve on the actuator to decrease the pressure on the truck actuator and the lines (Ref 32-13-15/401).

 D.  
Procedure

 S 034-006
 (1)  
Disconnect and seal the hydraulic lines from the valve.

 S 034-007

 (2)  
Hold the valve and remove the three bolts.

 S 024-008

 (3)  
Remove the valve.

 S 034-009

 (4)  
Remove the hydraulic fittings from the valve.

 (a)  
Seal the valve ports.

 TASK 32-13-16-404-010
 3.  The Body Gear Truck Positioning Pressure Reducing Valve Installation____________________________________________________________________ (Fig. 401)
 A.  Consumable Materials
 (1)  
D00288 Lubricant (Skydrol Assembly Lube), MCS 352

 B.  
References

 (1)  
09-11-00/201, Towing

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747-400
MAINTENANCE MANUAL

 (2)  
12-12-01/301, Hydraulic Systems

 (3)  
29-11-00/201, Main Hydraulic Supply System

 (4)  
32-00-30/201, Landing Gear Door Locks

 (5)  
32-13-15/401, Body Gear Truck Positioning Actuator

 (6)  
IPC 32-13-16 Fig. 1

 C.
Access

 (1)  
Location Zone
 755 Body Landing Gear, LH
 765 Body Landing Gear, RH

 D.
Prepare for The Procedure

 S 434-011
 (1)  
Install the hydraulic fittings in the valve ports with the new O-rings, gaskets and the backup rings.

 (a)  
Lubricate the O-rings, gaskets and the backup rings with Skydrol lubricant during the installation.

 E.
Procedure

 S 424-012
 (1)  Attach the valve with the three bolts, the washers and the nutplates shown on Figure 401.
 NOTE: Install the bolts with the heads forward.
____
 S 434-013
 (2)  
Remove the plugs from the hydraulic lines.

 S 434-014

 (3)  
Connect the hydraulic lines to the valve.

 S 864-026
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (4)  
Pressurize hydraulic system No. 1 (AMM 29-11-00/201).

 (5)  
Examine the hydraulic connections for leaks.

 S 794-016
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747-400 MAINTENANCE MANUAL
 S 874-017
 (6)
Open the bleed valve to bleed the system on the truck actuator.

 (a)  
Permit approximately 1 to 2 pints of fluid to flow from the valve.

 (b)  
Permit more fluid to flow from the valve if the bubbles stay in the system.

 NOTE: Install a hydraulic fuse in the truck system if the
____ flow stops. Hold the manual bypass lever in the up position for two seconds to set the fuse again.
 S 434-018
 (7)  
Close the actuator bleed valve.

 S 864-019
　
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